Simple Robust Estimation of Gradient Delays for Spiral MRI

Ryan Keith Robison¹, James Grant Pipe¹

Timing delays between gradient transmission and data sampling are a major source of artifact in spiral MRI. These delays result most often from eddy currents, among other things. Many of the common methods used to measure these delays require specialized hardware, advanced pulse sequences, or very small phantoms. A simple technique is proposed to measure gradient delays associated with a spiral sequence on all three gradient axes in six excitations.